This feataure becomes available when you complete Campaign mode. In Hardcore mode you restart from the last save game and only have 3 save slots for the entire campaign. You cannot start this difficulty from the 'New Game +' option.
When you complete 'Dead Space: Ignition' in Single-Player Ignition mode you will get the following bonuses; Hacker suit which has bonus perks and hacking capabilities, a Hacker-themed Contact Beam weapon skin, exclusive audio logs, extra power nodes, health packs and credits.
When you have completed the game under the Hardcore difficulty setting this weapon can be found at the first shop in a New Game+. The hand cannon has unlimited ammunition and one hit kill capability, it resembles a foam finger and when fired Isaac makes 'Bang Bang' and 'Pew Pew Pew' noises.
The refurbished Plasma Cutter is a high-energy mineral cutter and becomes available at the start of the game when you have a saved game file from the original 'Dead Space'. It costs 0 credits and can be found on any store at any time.
Complete 'Dead Space: Ignition' in Single-Player mode to unlock the following 2 suits that give you 25% more resistance to any hit.
Unlock Elite Engineering Suit: Complete the game to unlock the Riot Armour Suit at the store and the Elite Engineer Suit schematic near the first store. Start a new game session to get the Vintage Elite Suit in Chapter 6, the Security Elite Suit in Chapter 9, and the Advance Elite Suit in Chapter 11.